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Getting Started with uClinux for STR710

4

Use uClinux

UClinux is composed of:

● Sash command shell – standard command shell supporting Linux commands

● Memory Technology Device (MTD) subsystem – subsystem for data management and

memory driver development

If you have not modified the uClinux distribution, then it also includes a

Sample I2C EEPROM

application.

4.1

Sash command shell

The Sash command shell is automatically launched after the uClinux kernel is booted (

Figure 8).

This is a standard command shell that supports most of the Linux commands. The user can add

other commands when he compiles the uClinux distribution.

4.2

Memory Technology Device (MTD) subsystem

MTD (Memory Technology Device) is a Linux subsystem aimed at simplifying the development of

hardware memory drivers and the management of data stored in memory devices, especially Flash

devices. The highest layer of MTD subsystem is called "MTD user module," which provides a user-

level interface to the application layer. JFFS2 (Journaling Flash File System Version 2) is used to

implement the MTD user module in this project.

The 4 MB external flash memory is divided into 3 MTD partitions. Execute the command cat/

proc/mtd

to view the partition information:

The third partition is automatically mounted to the directory /mnt/mnt1 as a JFFS2 partition when

uClinux is up. Total size of this partition is 2 MB, and user can perform file operations on this

partition such as, copy (cp), delete (rm), delete directory (rmdir), rename (mv), create directory

(mkdir), open text editor (vi), etc..

Figure 11: Sash command shell

mtd0offset 0x0 ~ 0x10000Store the Bootloader

mtd1offset 0x10000 ~ 0x200000Store the uClinux zimage

mtd2offset 0x200000 ~ 0x400000Used as a JFFS2 partition